strftime("%s") fails on windows

[ekkah]

master d2067e4
strftime("%s") does not work on my windows using python 3.12.1
cols.append("%s" % datetime.datetime.strptime(cols[0], "%Y-%m-%d").strftime("%s"))

this snippet works fine on both linux and windows
date_obj = datetime.datetime.strptime(cols[0], "%Y-%m-%d")
timestamp = int(date_obj.timestamp())
cols.append(str(timestamp))